Engine cooling system onboard diagnostic strategy

a technology for diagnosing strategies and engine cooling systems, applied in the direction of machines/engines, mechanical equipment, instruments, etc., can solve problems such as logging of cooling system faults

Active Publication Date: 2010-04-22
CATERPILLAR INC
View PDF11 Cites 43 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Finally, a cooling system fault is logged if a comparison from the comparing step sati

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Engine cooling system onboard diagnostic strategy
  • Engine cooling system onboard diagnostic strategy
  • Engine cooling system onboard diagnostic strategy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016]Some motorized machines include an onboard diagnostic system for identifying an engine cooling system failure. In one specific example, automobile manufacturers may use a “predictive” approach that employs a temperature sensor fluidly positioned between the engine and the thermostat, and in communication with the electronic engine controller. By comparing an actual engine start temperature curve to a predicted curve, the onboard diagnostic algorithm can determine whether a thermostat failure has occurred. The failure may be logged by the engine controller, and may be communicated to the operator via some suitable means, such as a dashboard service engine soon light. This type of onboard diagnostic strategy works well in applications where the manufacturer has accurate and predictable data with regard to heat and cooling demands placed on the engine cooling system. Since most automobile manufacturers make, assemble and are familiar with the various hardware components of their ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

An onboard cooling system diagnostic strategy utilizes at least one temperature sensor fluidly positioned between an electronically controlled engine and a thermostat. The diagnostic algorithm operates by monitoring coolant temperature during engine startup. By comparing the actual coolant temperature during engine start-up to a predicted coolant temperature that should occur if no cooling system error is present, a cooling system fault condition may be identified. If a cooling system fault is detected, the diagnostic logic may activate the engine cooling fan or intrusively open an electrically controlled thermostat while monitoring the coolant temperature response to the intrusive action. If there is a substantial change in coolant temperature responsive to the intrusive action, this phenomenon can be utilized to correctly distinguish between a thermostat failure and a vehicle configuration error corresponding to an overcooled vehicle. The present disclosure also can utilize a similar strategy to diagnose problems associated with other vehicle fluid coolers that exchange heat with ambient air moved by a circulation fan.

Description

RELATION TO OTHER PATENT APPLICATION[0001]This application claims priority to provisional patent application 61 / 196,944, filed Oct. 22, 2008 with the same title, which is incorporated by reference herein.TECHNICAL FIELD[0002]The present disclosure relates generally to onboard diagnostic systems for machines, and more particularly to an engine cooling system onboard diagnostic strategy that distinguishes between thermostat failures and vehicle configuration errors.BACKGROUND[0003]Emissions from an internal combustion engine can be significantly affected by the operating temperature of the engine. If a faulty thermostat is stuck in an open position, excess undesirable emissions can result due to an extended warm up period for the engine. Alternatively, if too many heat exchangers that exchange heat with engine coolant are added to a final machine, the engine might also warm up slowly. In extreme situations the engine may not be able to warm up completely to normal operating temperatur...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): F01P7/00G01M15/00
CPCF01P7/165F01P11/16F01P2025/32G01M15/042F01P2060/045F01P2060/08F01P2060/10F01P2060/04
Inventor LIN, GEORGEGAMBHIR, GURPREETGETE, ZENEBE
Owner CATERPILLAR INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap